IEC 61375-2-8:2021适用于根据IEC 61375-2-3:2015、IEC 61375-2-5:2014和IEC 61375-3-4:2014实施的所有设备和装置，即，它涵盖了应证明符合性时应用于此类设备和装置的程序。本文档对TCN实现的适用性允许对实现本身进行单独的一致性检查，并且是不同TCN实现之间进一步互操作性检查的先决条件。

IEC 61375-2-8:2021 applies to all equipment and devices implemented according to IEC 61375-2-3:2015, IEC 61375-2-5:2014 and IEC 61375-3-4:2014, i.e. it covers the procedures to be applied to such equipment and devices when the conformance should be proven. The applicability of this document to a TCN implementation allows for individual conformance checking of the implementation itself, and is a pre-requisite for further interoperability checking between different TCN implementations.